object ForGuardDemo extends App {
  //定义班级英语成绩
  val englishScores:Array[Int] = Array(75,58,90,65,52,88,72,45,68,70,59,82)

  //初始化变量
  var passCount = 0
  val totalStudents = englishScores.length
  val passScores = collection.mutable.ListBuffer[Int]()

  //使用for循环守卫筛选及格成绩
  for (score <- englishScores if score >=60){
    passCount += 1
    passScores += score
    println(s"及格成绩：$score")

  }
  //计算及格率
  val passRate = (passCount.toDouble / totalStudents) * 100
  //输出结果
  println(s"\n及格成绩列表：$passScores")
  println(s"及格人数:$passCount/totalStudents")
  println(f"及格率：$passRate%.1f%%")
}
